Incandescent-lamp socket.



P. E. SEELEY.

INGANDESGENT LAMP SOCKET.

APPLICATION FILED APR. 21. 190B.

Patented Apr. 13, 1909.

ATTORNEYS UNITED STATES PATENT OFFICE.

FRANK E. sEELEY, or BRIDGEPORT, GONNEOTIGUL'AS TO THE BRYANT C C COMPANY, or BRIDGEPQRT, CONNECTICUT,

A CORPORATION F CONNECTIGUT.

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Specification 0! Letters Patent.

Patented April 13, 1909.

Application and April 21, mos. sum 180,488,398.

T0 all whom it may concern:

Be. it known that I, FRANK E. SEELEY, a citizen of the United States of America, and residing at Bridge ort, in the county of Fairfield and State of onnecticut, have invented a certain newand useful Improvement in In- .my invention in one form,

cross section of the latter; and Fig. 4 is a sec- 'tion of one of the insulating bushings for bushing to such and securing the bearing of the spindle.

In the sockets ingenerai use in which a metal key is used it is customary to insulate the latter from the spindle carrying the contact piece by mounting a bus ling with an insulating lining on the end of the spindle the key to the bushing. The heat of the lamp however is cient to soften the insulating hning of the an extent that its purchase upon the spindle is so weakened that when the key is turned the bushing merely swivels u on the spindle without actuating it. To 0 viate this disadvantage I propose to thread the key sulate the latter by suitable means from the electrically live parts of the socket with which it is in contact in the construction now 111 general use. To this end I insert insulating bushings 8 in the bearings for the spindle in the standards 9 and 9 of the plate 10, to

, which one of the leading in wires is attached through the binding screw 11. The rotary contact piece which is carried by the spindlev isinsulated therefrom inany suitable mannor-as for instance by forcing a band 12 of frequently sufii Gdirectly upon the spindle 7, and in over a shell 13, bearing conducting material The an envelop 14 of insulating material. inner face of the shell which is metal resents a rigid surface or the wings 15 ont e spindle to bear against and also affords a satisfactory bearing for the contact piece on the spindle which passes through the hole 16, while the envelo 14 thoroughly insulates the band and shell rom each other. The presence of the insulating material on the outer face of the shell serves also to prevent accidental contact between the standard 9 and the contact piece.

The particular construction which I have disclosed may be readily varied without departing from the scope of my invention as indicated in the following claims and I do not limit myself to the details shown.

I claim as my invention:

1. An electrical device of the character described, having a rotary spindle and a contact piece carried thereby, com rising an ex ternal conducting band, a shel within the same and an inter osed insulating envelop.

2. An electrical device of the character described, having a rotary spindle and a contact piece carried thereby, com rising an externa conducting band, a shel within the same and an interposed insulating envelop completely covering the outer surface of the latter.

3. An electrical device of the character described having a rotary spindle and a c'ontact iiece carried thereby, com rising an externa conducting band, a shel within the same and an inter osed insulating envelop,

said shell being per orated to permit the passage of the spindle theretlirough and forming a bearing therefor, substantially as described.

In testimony whereof I have signed my name to this specification, 1n the presence of referably of" 

